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Alloy member

Active Publication Date: 2020-04-30
NGK INSULATORS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides an alloy member that can prevent the chromium oxide layer from separating from the base member.

Problems solved by technology

When a chromium oxide layer separates from a base member, chromium is likely to vaporize from the base member to the outside, and thus there is a risk that electrodes of electrochemical cells will deteriorate through chromium poisoning.

Method used

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  • Alloy member
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Examples

Experimental program
Comparison scheme
Effect test

first embodiment

1. First Embodiment

[0015]Configuration of Alloy Member 200

[0016]An alloy member 200 according to this embodiment is used in a stack in which at least two electrochemical cells are stacked (referred to as an “electrochemical cell stack” hereinafter). An “electrochemical cell” is a device for changing chemical energy into electric energy, or a device for changing electric energy into chemical energy, and is a generic term for a pair of electrodes disposed to generate electromotive force from an overall redux reaction. Examples of the electrochemical cell include fuel cells in which protons serve as carriers, secondary cells (such as a nickel-zinc secondary battery and a zinc-air secondary battery), and electrolytic cells for generating hydrogen and oxygen from water vapor.

[0017]FIG. 1 is a cross-sectional view of the alloy member 200 according to the first embodiment. FIG. 1 shows an enlarged portion located near the surface of the alloy member 200.

[0018]The alloy member 200 is used i...

second embodiment

2. Second Embodiment

[0070]An alloy member 300 according to a second embodiment will be described with reference to the drawings. FIG. 4 is a cross-sectional view of the alloy member 300 according to the second embodiment. FIG. 4 shows an enlarged portion located near the surface of the alloy member 300.

[0071]The alloy member 300 includes a base member 210 and a chromium oxide layer 211.

[0072]The base member 210 is formed into a plate shape. The base member 210 may have a flat plate shape or a curved plate shape. Although there is no particular limitation on the thickness of the base member 210, the thickness thereof may be 0.1 to 2.0 mm, for example.

[0073]The base member 210 is constituted by an alloy material containing Cr (chromium). An Fe—Cr-based alloy steel (stainless steel etc.), a Ni—Cr-based alloy steel, or the like may be used as such a metal material. Although there is no particular limitation on the Cr content in the base member 210, the Cr content may be 4 to 30 mass %.

[...

third embodiment

3. Third Embodiment

[0116]An alloy member 400 according to a third embodiment will be described with reference to the drawings. FIG. 5 is a cross-sectional view of the alloy member 400 according to the third embodiment. FIG. 5 shows an enlarged portion located near the surface of the alloy member 400.

[0117]The alloy member 400 includes a base member 210, a chromium oxide layer 211, and anchor portions 216.

[0118]The base member 210 is formed into a plate shape. The base member 210 may have a flat plate shape or a curved plate shape. Although there is no particular limitation on the thickness of the base member 210, the thickness thereof may be 0.5 to 4.0 mm, for example.

[0119]The base member 210 is constituted by an alloy material containing Cr (chromium). An Fe—Cr-based alloy steel (stainless steel etc.), a Ni—Cr-based alloy steel, or the like may be used as such a metal material. Although there is no particular limitation on the Cr content in the base member 210, the Cr content may ...

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Abstract

The alloy member includes a base member constituted by an alloy material containing chromium, a chromium oxide layer for covering at least a portion of a surface of the base member, a pore that is formed in an interface region of the base member that is located 30 μm or less from an interface between the chromium oxide layer and the base member, and an extending portion extending from the pore into the base member. The pore is configured to inhibit separation of the chromium oxide layer from the base member The extending portion contains an oxide of an element whose equilibrium oxygen pressure is lower than that of a major element of the base member.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation application of PCT / JP2019 / 034576, filed Sep. 3, 2019, which claims priority to Japanese Application No. 2019-009259, filed Jan. 23, 2019, Japanese Application No. 2018-197004, filed Oct. 18, 2018, and Japanese Application No. 2018-168073, filed Sep. 7, 2018, the entire contents all of which are incorporated hereby by reference.TECHNICAL FIELD[0002]The present invention relates to an alloy member.BACKGROUND ART[0003]In a cell stack provided with fuel cells, which is one type of electrochemical cell, conventionally, an alloy member has been used in a current collector member for collecting electrical current from the fuel cells, a separator for isolating the fuel cells, a manifold for supplying gas to the fuel cells, or the like (e.g., see Japanese Patent No. 6383003).[0004]Usually, an alloy member includes a base member constituted by an alloy material containing chromium and a chromium oxide layer formed...

Claims

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Application Information

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IPC IPC(8): H01M8/0245H01M8/0232H01M8/0236C23C14/08C23C14/02C23C28/04
CPCH01M8/0245H01M8/0232C23C28/042H01M8/0236C23C14/028C23C14/083H01M4/662H01M8/0208H01M8/021H01M8/0215H01M8/0228H01M2008/1293H01M8/2483H01M8/2484Y02E60/10Y02E60/50B32B3/30Y10T428/249956
Inventor TANAKA, YUKINAKAMURA, TOSHIYUKIOHMORI, MAKOTO
Owner NGK INSULATORS LTD